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阐述了能力谱pushover分析方法的基本原理和过程,以宁夏大坝大型汽轮发电机框架式基础为例,采用静力弹塑性分析方法对其进行抗震性能评估.研究结果表明:大型汽轮发电机框架式基础振型参与质量集中分布在前两阶振型,结构动力行为类似于单自由度体系(SDOF);罕遇地震作用下,汽轮发电机框架式基础最大位移小于其限值;基础结构的塑性铰主要出现在梁柱节点及柱脚,屈服程度较轻;平台层主梁尚未出现塑性铰.对静力和动力弹塑性分析两种方法的结果进行了比较,探讨静力弹塑性分析在大型汽轮发电机框架式基础抗震性能评估的适用性,为汽机基础的抗震性能分析提供了参考.
The basic principle and process of pushover analysis of capacity spectrum are described. Taking the frame foundation of large-sized turbine generator in Ningxia Dam as an example, the static elastoplastic analysis method is used to evaluate its seismic performance. The results show that large- The basic vibration modes of frame-supported foundation modes are concentrated in the first two modes, and the dynamic behavior of the structure is similar to that of single-degree-of-freedom system (SDOF). Under the rare earthquakes, the maximum displacement of frame- The plastic hinge of the basic structure mainly appears at the beam-column joint and the column foot, and the yielding is light; the plastic hinge has not yet appeared on the main girder of the platform layer. The results of static and dynamic elasto-plastic analysis methods are compared, The applicability of plastic analysis in the seismic evaluation of large-scale turbo-generator frame foundations provides a reference for the seismic performance analysis of turbine foundation.